RFID Reader Deployment Using Lidar for Dense-Tag Coverage
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Solution Overview
Problem
In environments with a dense population of RFID tags, existing RFID readers struggle to read all tags due to signal blocking and scattering, necessitating multiple readers that can be costly and inefficiently spaced, with physical obstacles limiting installation locations.
Innovation Solution
A method for determining optimal RFID reader locations using lidar scans and adjustable mounts to ensure complete tag coverage, adjusting for physical obstructions and tag heights, and iteratively refining reader positions to minimize gaps and costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple RFID readers are installed to read all tags in dense environments, then tag reading coverage is improved, but installation cost and device complexity increase
Solution Approach 1:
The patent transitions from 2D floor-plan-based reader placement to 3D spatial optimization by incorporating ceiling heights, tag heights, and coverage volume intersections. This dimensional expansion enables more accurate determination of reader locations that ensure complete tag coverage while minimizing the number of readers needed.
Solution Approach 2:
The system performs preliminary power calculations and coverage volume analysis before installing RFID readers. By computing required reader locations in advance based on environmental parameters (ceiling heights, wall locations, fixture positions) and RFID tag characteristics, the system optimizes reader placement to achieve complete coverage with minimum readers.
2Reliability
If RFID readers are spaced closer together to ensure complete tag coverage, then reading reliability improves, but installation cost increases
Solution Approach 1:
The patent dynamically adjusts reader spacing based on calculated parameters including ceiling height, tag height, RFID signal power characteristics, and coverage volume intersections. By optimizing these parameters, the system determines the maximum effective spacing between readers while ensuring complete tag coverage, thereby minimizing the total number of readers required.
3Ease of manufacture
If RFID readers are installed without considering physical obstructions, then installation ease improves, but signal reliability deteriorates
Solution Approach 1:
The system performs preliminary analysis of physical obstructions (walls, fixtures, ceiling structures) using provided environmental data before determining reader locations. This advance planning identifies optimal mounting positions that avoid signal-blocking obstructions while maintaining installation feasibility, ensuring both signal reliability and practical installability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Ensures comprehensive RFID tag reading with reduced reader density and installation costs by strategically placing readers to intersect coverage volumes and adapt to environmental obstructions.
Implementation Method 1
Passive RFID tags essentially modulate and backscatter energy from an RF interrogation pulse sent by the RFID reader to transmit a reply
Implementation Method 2
The ceiling heights, locations of walls and/or fixtures, and actual locations of the RFID readers can be measured by performing lidar scans of the installation site before and after installation
Data Source
AI summary
Methods and apparatus for deploying RFID readers in an RFID environment that contains dense populations of tags are described. The RFID readers are deployed using a process that provides adequate link margins so that communication can be established with RFID tags in all regions of interest within the RFID environment.